| 摘要 |
PROBLEM TO BE SOLVED: To provide a door improvable in silencing property. SOLUTION: The door 1 is provided with a door body 1d having a first door surface facing one space, a second door surface 1b facing the other space, and a door bottom face 1c and a door upper face 1u opposed to the door bottom face 1c. The door body 1d has propagation passages 2, 7 opened to the door bottom face 1c or the door upper face 1u and propagating sound, and propagation passage forming members 3, 8 forming the propagation passages 2, 7. The propagation passage forming members 3, 8 are set to increase or decrease the passage cross-sectional areas of the propagation passages 2, 7 (2a, 2b, 2c, 2d, 7a, 7b, 7c, 7d) along the propagation direction of sound. COPYRIGHT: (C)2006,JPO&NCIPI
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